Take-up for sewing-machines.



PATENTED NOV. 20, 1906.

O. PEDERSEN.

TAKE-UP FOR SEWING MACHINES.

APPLICATION. FILED AUG.'14.19,05.

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TAKE-UP FOR SEWING MACHINES.

APPLIOATION PILBD AUG.14.1905.

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UNITED STATES PlIENT OFFIOE.

CHRISTIAN PEDERSEN, OF ST. LOUIS, MISSOURI, ASSIGNOR TO LANDIS MACHINECOMPANY, OF ST. LOUIS. MISSOURI, A CORPORATION OF MISSOURI.

TAKE-UP FOR SEWING-MACHINES.

I No. 836,208.

Specification of Letters Patent.

7 Patented Nov. 20, 1906.

Application filed August 14, 1905. Serial No. 274.113.

enable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, forming partof this specification, in which Figure 1 is a side elevational view ofthe mechanism involved in my invention, part of the frame beingillustrated in sections and showing the take-up lever in its uppermostposition. Fig. 2 is a similar view showing the take-up lever in itslowermost position. Fig. 3 is a cross-sectional view through thestop-arm. Fig. 4 is a detail elevational view of the take-up lever, andFig. 5 is a cross-sectional view on line 5 5 of Fig. 4.

This invention relates to sewing-machines, and particularly to that typeknown as waxthread sewing-machines, which are used principally forsewing leather.

The object of my invention is to provide a novel form of take-upmechanism for holding the needle-thread taut and also for drawing saidthread from the shuttle after the shuttle has passed through the looptherein to form the stitch. I have herein illustrated my novel take-upmechanism in conjunction with the needle and shuttle mechanism of asewing-machine; but as said needle and shuttle mechanism form no part ofmy present invention I have not described the same.

The machine herein shown as illustrating the preferred form of myinvention is provided with a thread-measurer, which automatically drawsfrom the needle-thread supply just the required amount of thread forforming a stitch; but it should be understood that my take-up mechanismis not limited in its use to a machine provided with a threadmeasuringmechanism, but could be used equally well in a machine not having athread-measurer and provided simply with tension-plates or any suitableform of tension device.

Referring now to the preferred form of my invention as illustrated inthe drawings, 1

' designates a frame in which is suitably journaled a rotatable shaft 2.The shaft 2 carries a fixed cam 3, which is provided with a groove 4 ofirregular formation and having a portion 5, the'radial distance of whichwith respect to the shaft is considerably greater than the radialdistance of the remaining por tion of the cam. The reason for this willbe fully explained hereinafter.

6 designates a rock-shaft, which is journaled in suitable bearings inthe frame, and fixed on said rock-shaft is a depending actuating-arm 7,which is in the form of an elbowlever, at the angle of which is a roller8, movable in the groove and cooperating with the cam, whereby arotation of the shaft 2 will impart an up-and-down movement to the endof the lever distant from the rock-shaft 6.

9 designates a bracket which is suitably supported upon the frame and ina plane below the rock-shaft 6. This bracket carries a journal-bearing10, in which is mounted a rock-shaft 11, having fixed at one end acrank-arm 12. This crank-arm 12 is provided with an'offset, which ismovable in a slot 13 in the lower end of the lever 7, so that anymovement which is imparted to the lever 7 will be transmitted to therock-shaft through the arm. 12.

14 designates a fixed arm projecting in a direction approximatelyopposite to the arm 12, and said arm 14 is provided with an adjustablestop or abutment 15, which projects transversely through said arm andwhich is adapted to engage and move the looselymounted take-up arm orlever 16, which is carried by the shaft 11, the adjustability of saidstop permitting the degree of movement imparted to said lever 1.6 to bevaried. The heel or rearwardly-projecting end 17 of the lever 16 isprovided with a slot 18, adapted to be engaged by a pin 19 on the lever14, whereby the loose swinging movement of said take-up lever 16 will belimited. The take-up lever 16 is yieldingly connected to a rigid part ofthe frame by an expansible spring 20, which is fastened to said lever inrear of its fulcrum, so that the normal tendency of the spring will beto depress the forward end of said lever and hold the lower end of theslot 18 in engagement with the pin 19.

The thread leads from the thread-measurer, with which the machine isprovided and a portion 21 of which is shown in Figs. 1 and 2 of thedrawings, and then passes through the wax-pot under the idler 22, thenceover the idler 23 to the roll 24 on. the extreme are timedto move inproper sequence.

end of the take-up lever 16, and finally to the needle and shuttle.

In Fig. 1 the take-up mechanism is illustrated as in position after theshuttle has passed throu h the loop in the thread to lock the needle-tread and shuttle-thread together, and in Fig. 2 it is illustrated as inposition after the thread has been drawn from the-shuttle to form thestitch. The shuttle mechanism and the take-up mechanism are socorrelated with the shaft 2, from which they derive their power, thatall of the pahrts or example, after the shuttle has passed through theloop in the thread and has carried the thread into the position shown inFig. 1 the relatively deep portion of the cam will be engaging theroller 8, so as to elevate the forward end of the lever 16. Furthermovement of the main shaft 2 brings the shallow portion of the cam3 intocontact with the roller 8, so as to raise the forward end of said lever7, and thereby depress the forward end of the take-up lever 16 to drawthe thread from the shuttle to form the stitch.

In order to maintain the thread taut at all times, it is necessary thata proper adjustment be made, so as to control the degree of movement ofthe lever 16, this being provided for by the adjustable stop 15, whichengages and moves said lever 16.

As previously stated, it is immaterial so far as the operation of myimproved take-up mechanism is concerned whether or not the machine beprovided with a thread-measurer, and if the machine were provided simply with tension-plates or any other suitable tension device theoperation of the take-up would be the same namely, to draw theneedle-thread from the shuttle and always keep said thread taut.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a sewing-machine, a rock-shaft pro vided with an arm 14 having anengaging device in its outer end, a -take-up lever loosely mounted onsaid shaft and adapted to be engaged by the device in said arm,cooperating means on said arm and lever for limiting their movementrelatively to each other, and means for actuating the rock-shaftsubstantially as described.

2; In a sewing-machine, a rock-shaft provided with an arm, a take-uplever loosely mounted on said shaft and extending in the same directionas said arm, a device carried by said arm for engaging the take-up leverto impart movement thereto in one direction, means for actuating therock-shaft, means for governing the position of said take-up leverrelatively to said arm, and yielding means for moving the take-up leveraway from said arm; substantially as described.

3. In a device of the class described, the combination with a rock-shaftmounted in a stationary bearing and having an arm thereon, acam-actuated lever for imparting move ment to said rock-shaft and inengagement with the arm thereon, a take-up lever loose on saidrock-shaft, a second arm on said rockshaft and provided with a rigidabutment for engaging the take-up lever to move it positively, and meansfor limiting the free movement of said take-up lever; substantially asdescribed.

4. The combination with a drive-shaft of a move it positively inonedirection as said shaft is rocked, and means carried by said secondarm and cooperating with said takeup lever for moving it in the oppositedirection back to normal position and also for determining the normalposition of said lever; substantially as described.

In testimony whereof I hereunto affix my signature, in the presence oftwo witnesses, this 11th day of August, 1905.

CHRISTIAN PEDERsEN.

Witnesses; I I

B. F. FUNK, GEORGE BAKEWELL.

